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`); doc.close(); } // Tab key support document.querySelectorAll('textarea').forEach(ta=>{ ta.addEventListener('keydown',e=>{ if(e.key==='Tab'){e.preventDefault();const s=ta.selectionStart,end=ta.selectionEnd;ta.value=ta.value.substring(0,s)+' '+ta.value.substring(end);ta.selectionStart=ta.selectionEnd=s+2;autoRun()} }); }); run();